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首页> 外文会议>Beijing International Materials Week(2006 BIMW) Conference C; International Conference on New Energy Materials; 20060625-30; 20060625-30; Beijing(CN); Beijing(CN) >Effects of substituting Ni with M (M = Cu, Al and Mn) on microstructures and electrochemical characteristics of La-Mg-Ni system (PuNi_3-type) electrode alloys
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Effects of substituting Ni with M (M = Cu, Al and Mn) on microstructures and electrochemical characteristics of La-Mg-Ni system (PuNi_3-type) electrode alloys

机译：用M（M = Cu，Al和Mn）代替Ni对La-Mg-Ni系（PuNi_3型）电极合金的组织和电化学特性的影响

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摘要

In order to improve the electrochemical cycle stability of La-Mg-Ni system (PuNi3-type) hydrogen storage alloy, Ni in the alloys was partially substituted by M (M = Cu, Al, Mn) . A new La-Mg-Ni system electrode alloys La_(0.7)Mg_(0.3)Ni_(2.55-x)Co_(0.45)M_x (M = Cu, Al, Mn; x = 0, 0.1) were prepared by casting and rapid quenching. The effects of element substitution and rapid quenching on the microstructures and electrochemical performances of the alloys were investigated. The results by XRD, SEM and TEM show that the alloys have a multiphase structure, including the (La, Mg) Ni_3 phase, the LaNi_5 phase and the LaNi_2 phase. The rapid quenching and element substitution have an imperceptible influence on the phase compositions of the alloys, but both change the phase abundance of the alloys. The rapid quenching significantly improves the composition homogeneity of the alloys and markedly decreases the grain size of the alloys. The Cu substitution promotes the formation of an amorphous phase in the as-quenched alloy, and a reversal result by the Al substitution. The electrochemical measurement indicates that the element substitution decreases the discharge capacity of the alloys, whereas it obviously improves the cycle stability of the alloys. The positive influence of element substitution on the cycle life of the alloys is in sequence Al > Cu > Mn, and negative influence on the discharge capacity is in sequence Al > Mn > Cu. The rapid quenching significantly enhances the cycle stability of the alloys, but it leads to a different extent decrease of the discharge capacity of the alloys.
机译：为了提高La-Mg-Ni系（PuNi3型）储氢合金的电化学循环稳定性，合金中的Ni部分被M（M = Cu，Al，Mn）取代。通过铸造并快速制备了新的La-Mg-Ni系电极合金La_（0.7）Mg_（0.3）Ni_（2.55-x）Co_（0.45）M_x（M = Cu，Al，Mn; x = 0、0.1）淬火。研究了元素置换和快速淬火对合金组织和电化学性能的影响。 XRD，SEM和TEM分析结果表明，该合金具有多相结构，包括（La，Mg）Ni_3相，LaNi_5相和LaNi_2相。快速淬火和元素置换对合金的相组成具有不可察觉的影响，但都改变了合金的相丰度。快速淬火显着改善了合金的组成均匀性，并显着减小了合金的晶粒尺寸。 Cu置换促进了淬火后的合金中非晶相的形成，并且通过Al置换而逆转结果。电化学测量表明，元素置换降低了合金的放电容量，但是显然提高了合金的循环稳定性。元素置换对合金循环寿命的正面影响依次为Al> Cu> Mn，而对放电容量的负面影响则依次为Al> Mn> Cu。快速淬火显着增强了合金的循环稳定性，但导致合金的放电容量不同程度地降低。

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